The plague is a deadly infectious disease that is caused by a bacteria, Yersinia pestis, usually carried by some rodents.[1]

The Black Death is the name of a mass outbreak of the plague that spread throughout Europe during the Middle Ages, peaking in the mid-14th century. Nicholas Malfoy, a wizard who lived during that time, was believed to have killed many Muggle tenants, covering up their deaths as plague victims. This has never been conclusively proven and, if this is true, he was not censured by the Wizards' Council in any way.

In 1992, there was an outbreak of plague rats in the dark alleyways off Knockturn Alley, in London. If bitten, a human would have become infected.[2]


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